Article Dans Une Revue The Astrophysical Journal Année : 2022

ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): How Do Dense Core Properties Affect the Multiplicity of Protostars?

Qiu-Yi 秋怡 Luo 罗
Tie 铁 Liu 刘
Ken’ichi Tatematsu
Sheng-Yuan Liu
Pak Shing Li
James Di Francesco
Doug Johnstone
Paul F Goldsmith
Somnath Dutta
Naomi Hirano
Chin-Fei Lee
Di Li
Kee-Tae Kim
Chang Won Lee
Jeong-Eun Lee
Xun-Chuan Liu
  • Fonction : Auteur
Mika Juvela
Jinhua He
Sheng-Li Qin
Hong-Li Liu
David Eden
Woojin Kwon
Dipen Sahu
Shanghuo Li
Feng-Wei Xu
Si-Ju Zhang
  • Fonction : Auteur
Shih-Ying Hsu
Leonardo Bronfman
Patricio Sanhueza
Veli-Matti Pelkonen
Jian-Wen Zhou
  • Fonction : Auteur
Rong Liu
  • Fonction : Auteur
Qi-Lao Gu
  • Fonction : Auteur
Yue-Fang Wu
Xiao-Feng Mai
Edith Falgarone
Zhi-Qiang Shen

Résumé

During the transition phase from a prestellar to a protostellar cloud core, one or several protostars can form within a single gas core. The detailed physical processes of this transition, however, remain unclear. We present 1.3 mm dust continuum and molecular line observations with the Atacama Large Millimeter/submillimeter Array toward 43 protostellar cores in the Orion molecular cloud complex (λ Orionis, Orion B, and Orion A) with an angular resolution of ∼0 35 (∼140 au). In total, we detect 13 binary/multiple systems. We derive an overall multiplicity frequency (MF) of 28% ± 4% and a companion star fraction (CSF) of 51% ± 6%, over a separation range of 300-8900 au. The median separation of companions is about 2100 au. The occurrence of stellar multiplicity may depend on the physical characteristics of the dense cores. Notably, those containing binary/multiple systems tend to show a higher gas density and Mach number than cores forming single stars. The integral-shaped filament of the Orion A giant molecular cloud (GMC), which has the highest gas density and hosts high-mass star formation in its central region (the Orion Nebula cluster), shows the highest MF and CSF among the Orion GMCs. In contrast, the λ Orionis GMC has a lower MF and CSF than the Orion B and Orion A GMCs, indicating that feedback from H II regions may suppress the formation of multiple systems. We also find that the protostars comprising a binary/multiple system are usually at different evolutionary stages.

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hal-05004415 , version 1 (25-03-2025)

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Qiu-Yi 秋怡 Luo 罗, Tie 铁 Liu 刘, Ken’ichi Tatematsu, Sheng-Yuan Liu, Pak Shing Li, et al.. ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): How Do Dense Core Properties Affect the Multiplicity of Protostars?. The Astrophysical Journal, 2022, 931, pp.158. ⟨10.3847/1538-4357/ac66d9⟩. ⟨hal-05004415⟩
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